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31 * @(#)endian.h 8.1 (Berkeley) 6/10/93
35 #ifndef _MACHINE_ENDIAN_H_
36 #define _MACHINE_ENDIAN_H_
38 #include <sys/cdefs.h>
39 #include <sys/_types.h>
42 * Define the order of 32-bit words in 64-bit words.
44 #define _QUAD_HIGHWORD 0
45 #define _QUAD_LOWWORD 1
48 * Definitions for byte order, according to byte significance from low
51 #define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */
52 #define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */
53 #define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */
55 #define _BYTE_ORDER _BIG_ENDIAN
58 * Deprecated variants that don't have enough underscores to be useful in more
62 #define LITTLE_ENDIAN _LITTLE_ENDIAN
63 #define BIG_ENDIAN _BIG_ENDIAN
64 #define PDP_ENDIAN _PDP_ENDIAN
65 #define BYTE_ORDER _BYTE_ORDER
68 #if defined(__GNUCLIKE_BUILTIN_CONSTANT_P) && defined(__OPTIMIZE__)
69 #define __is_constant(x) __builtin_constant_p(x)
71 #define __is_constant(x) 0
74 #define __bswap16_const(x) ((((__uint16_t)(x) >> 8) & 0xff) | \
75 (((__uint16_t)(x) << 8) & 0xff00))
76 #define __bswap32_const(x) ((((__uint32_t)(x) >> 24) & 0xff) | \
77 (((__uint32_t)(x) >> 8) & 0xff00) | \
78 (((__uint32_t)(x)<< 8) & 0xff0000) | \
79 (((__uint32_t)(x) << 24) & 0xff000000))
80 #define __bswap64_const(x) ((((__uint64_t)(x) >> 56) & 0xff) | \
81 (((__uint64_t)(x) >> 40) & 0xff00) | \
82 (((__uint64_t)(x) >> 24) & 0xff0000) | \
83 (((__uint64_t)(x) >> 8) & 0xff000000) | \
84 (((__uint64_t)(x) << 8) & ((__uint64_t)0xff << 32)) | \
85 (((__uint64_t)(x) << 24) & ((__uint64_t)0xff << 40)) | \
86 (((__uint64_t)(x) << 40) & ((__uint64_t)0xff << 48)) | \
87 (((__uint64_t)(x) << 56) & ((__uint64_t)0xff << 56)))
89 static __inline __uint16_t
90 __bswap16_var(__uint16_t _x)
93 return ((_x >> 8) | ((_x << 8) & 0xff00));
96 static __inline __uint32_t
97 __bswap32_var(__uint32_t _x)
100 return ((_x >> 24) | ((_x >> 8) & 0xff00) | ((_x << 8) & 0xff0000) |
101 ((_x << 24) & 0xff000000));
104 static __inline __uint64_t
105 __bswap64_var(__uint64_t _x)
108 return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) |
109 ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) |
110 ((_x << 24) & ((__uint64_t)0xff << 40)) |
111 ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56)));
114 #define __bswap16(x) ((__uint16_t)(__is_constant(x) ? __bswap16_const(x) : \
116 #define __bswap32(x) (__is_constant(x) ? __bswap32_const(x) : \
118 #define __bswap64(x) (__is_constant(x) ? __bswap64_const(x) : \
121 #define __htonl(x) ((__uint32_t)(x))
122 #define __htons(x) ((__uint16_t)(x))
123 #define __ntohl(x) ((__uint32_t)(x))
124 #define __ntohs(x) ((__uint16_t)(x))
126 #endif /* !_MACHINE_ENDIAN_H_ */